If `2x-4y=9` and `6x-12y+7=0` are parallel tangents to circle, then radius of the circle, is

If 2 x-4 y=9 and 6 x-12 y+7=0 are common tangtnts to a circle, then radius of the circle is

If the straight lines x-4y + 7=0 and 3x - 12y + 11 =0 are tangents to a circle. Then, the radius of the circle is

If 53x-54y+7=0and 106x-108y=-4 are the tangents of the circle , then radius of the circle is =.......

The lines 3x-4y +4=0 and 6x-8y-7=0 are tangents to the same circle. The radius of the circle is

If the lines 3 x - 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to a circle , then the radius of the circle is

If the lines 3x-4y+4=0 and 6x-8y-7=0 are tangents to a circle, then find the radius of the circle.